When your Razer Gaming Chair sinks every time you sit on it or you can no longer adjust the height, it has a faulty chair cylinder that needs replacement.
Tools needed:
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Rubber mallet
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Hex key
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Microfiber cloth
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Penetrating lubricant
Important: Put the chair over a smooth work surface to protect it from scratch and any other types of damage during the process.
Note: Images used in this article are for Razer Iskur.
Step-by-step process
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Remove the head cushion.
Note: Skip this step if your gaming chair has no head cushion.

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Straighten the backrest.

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Align both armrests straight.
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Adjust both armrests height to lowest.

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Set the chair to its lowest height.

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Turn the chair upside down.
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Apply some penetrating lubricant between the gas lift cylinder and wheelbase.
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Leave it for five minutes.

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Dislodge the wheelbase by pulling it while hitting the cylinder with the rubber mallet wrapped in a microfiber cloth.
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Make sure you hit only the outer rim of the gas lift cylinder and avoid using too much force when hammering.

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Unfasten the screws using the hex key to detach the tilt mechanism.

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Apply some penetrating lubricant between the gas lift cylinder and the tilt mechanism. Leave it for five minutes.
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Grip the gas lift cylinder firmly and hit the tilt mechanism with the rubber mallet wrapped in a microfiber cloth to separate.
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Separate the cylinder cover from the cylinder.

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Insert the replacement cylinder into the center of the base then place the cylinder cover on top.

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Connect base assembly to the chair by inserting the cylinder into the mechanism.
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Secure the tilt mechanism with screws.
